Post custom coolant code

Hello,
I have a problem with getting the coolant control right. My machine need for TSC a M104 and after this a P value which defines the Pressure my current approach is to use a misc integer so i can control the pressure. In the misc valuse i asign the mi5 value 100.

This have i written:
scool58 : "M104 P" + no2str(mi5$) + " (TSC Flood)" #Coolant 5 on value


and this is the program it produse:
N1015 M104 P0. (TSC Flood)

I hope anbody can help me figure out why it post P0 and not the 100.